Elliptical sieve
By setting up two sets of eccentric vibration exciters in the elliptical screen, and using the coupled motion principle to form a self-simultaneous eccentric rotational motion, the problems of high limitations, complex structure and low reliability in the prior art are solved, and the effects of efficient screening, simple structure and easy maintenance are achieved.
Patent Information
- Application Number
- CN202421474408.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-06-26
AI Technical Summary
In the prior art, vibrating screens have problems such as high limitations, complex structure and low reliability. In particular, the triaxial elliptical screens have shortcomings such as complex structure, high noise, difficult gear oil lubrication and sealing, and low reliability in practical applications.
An elliptical screen is designed. By setting up two sets of eccentric vibration exciters, using the coupled motion principle, the two sets of eccentric vibration exciters produce self-simultaneous eccentric rotational motion, thereby driving the screen box to move and forming an elliptical motion trajectory. The first group of eccentric exciters is close to the front end of the screen box, and the second group of eccentric exciters is close to the rear end of the screen box. The angle between the connecting line between the two groups of eccentric exciters and the horizontal plane is 30°-50°, preferably 40°.
Through this design, the advantages of three types of traditional vibrating screens are integrated, the screening efficiency is increased by 50-80%, the installation space is greatly reduced, the structure is simple, the maintenance is convenient, and the reliability is strong, which avoids the disadvantages of traditional vibrating screens.
Smart Images
Figure CN222943887U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an elliptical screen and belongs to the technical field of vibrating screens. Background Art
[0002] At present, the selection of screening equipment in the domestic market of metallurgy, coal and mining industry can be roughly divided into three categories: circular vibrating screen, linear vibrating screen and three-axis elliptical screen. The classification is based on the shape of the vibration track. The circular vibrating screen uses a set of eccentric exciters to make the screen box produce a circular motion track; the linear screen uses two sets of eccentric exciters to produce a linear motion track; the three-axis elliptical screen uses three sets of eccentric exciters to force the synchronization to produce a horizontal elliptical motion track to achieve material screening and grading.
[0003] The three types of vibrating screens in the prior art have the following technical problems in actual application due to factors such as raw material characteristics, finished product requirements, screening efficiency, and space occupation. The circular vibrating screen uses a set of eccentric vibrators to produce circular vibrations, which is only suitable for screening and grading of 3mm-200mm particles. The installation angle is 18-20 degrees, the screening efficiency decreases layer by layer, and the installation occupies a large space; the linear vibrating screen uses two sets of eccentric vibrators to produce linear motion, generally mainly single-layer screening, and has a good dehydration function for paste-like sand materials with a high water content, but has limitations in screening materials; the three-axis horizontal elliptical screen uses three sets of eccentric vibrators to produce horizontal elliptical motion. The three sets of eccentric vibrators rely on gear meshing to force synchronous rotation, which has the disadvantages of complex structure, high noise, difficult gear oil immersion lubrication and sealing, easy oil leakage, low reliability and inconvenient maintenance.
[0004] Therefore, a new solution needs to be proposed to solve this problem. Utility Model Content
[0005] The technical problem to be solved by the utility model is to provide an elliptical screen, which solves the problems of high limitation, complex structure and low reliability in the prior art.
[0006] The technical problem to be solved by the utility model is achieved by adopting the following technical solutions:
[0007] An elliptical screen comprises a screen box and two groups of eccentric vibrators. In the side projection view of the screen box, the first group of eccentric vibrators is close to the front end of the screen box, the second group of eccentric vibrators is close to the rear end of the screen box and is higher than the first group of eccentric vibrators, and the angle θ between the line between the two groups of eccentric vibrators and the horizontal plane is 30°-50°.
[0008] The utility model is further configured as follows: the angle θ between the connecting line between the two sets of eccentric exciters and the horizontal plane is 40°
[0009] The utility model is further arranged that: the center of mass of the screen box is located on the connection line of the two groups of eccentric vibrators.
[0010] The utility model is further configured as follows: the distance between the center of mass of the screen box and the first group of eccentric vibrators is L1, and the distance between the center of mass of the screen box and the second group of eccentric vibrators is 1.5L1-2.5L1.
[0011] The utility model is further configured as follows: the distance between the center of mass of the screen box and the second group of eccentric vibrators is 2L1.
[0012] The utility model is further configured as follows: rubber springs are arranged at the front and rear ends of both sides of the screen box.
[0013] The utility model is further configured such that the eccentric force generated by the first group of eccentric vibrators is greater than the eccentric force generated by the second group of eccentric vibrators.
[0014] The beneficial effects of the utility model are:
[0015] By setting up two groups of eccentric vibrators to cooperate and utilizing the principle of coupled motion, the two groups of eccentric vibrators are placed at different positions of the screen box respectively. By driving the two groups of eccentric vibrators to rotate, the two groups of eccentric vibrators produce self-synchronous eccentric rotational motion, thereby driving the screen box to move. The first group of eccentric vibrators close to the center of mass increases the number of eccentric blocks to form a larger eccentric force, driving the screen box to vibrate in a circular manner. After the second group of eccentric vibrators forms self-synchronization, it produces synchronous interference to the first group of eccentric vibrators, and generates a larger exciting force in the vertical direction of the connecting line. Since the eccentric forces of the two groups of eccentric vibrators are different, the two forces in the connecting line direction will not cancel each other out, thereby making the vibration trajectory form an elliptical motion.
[0016] It integrates the advantages of three types of traditional vibrating screens. The screen frame and screen mesh can be installed horizontally, effectively reducing the installation height. It avoids the disadvantages of traditional vibrating screens: the screening efficiency is increased by 50-80% compared with the circular vibrating screen, and the horizontal installation space is greatly reduced; the screening medium and classification diversity are increased compared with the linear screen; the manufacturing difficulty is reduced compared with the three-axis elliptical screen, and the structure is simple, maintenance is convenient, and reliability is strong. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0018] In the figure: 1. Screen box; 2. Eccentric vibrator; 3. Rubber spring. DETAILED DESCRIPTION
[0019] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific illustrations.
[0020] like Figure 1As shown, an elliptical screen includes a screen box 1 and two groups of eccentric vibrators 2, wherein rubber springs 3 are provided at the front and rear ends of both sides of the screen box 1. In the side projection view of the screen box 1, the first group of eccentric vibrators 2 is close to the front end of the screen box 1, and the second group of eccentric vibrators 2 is close to the rear end of the screen box 1 and is higher than the first group of eccentric vibrators 2.
[0021] The angle θ between the connecting line of the two groups of eccentric exciters 2 and the horizontal plane is 30°-50°. Preferably, the angle θ between the connecting line of the two groups of eccentric exciters 2 and the horizontal plane is 40°.
[0022] The center of mass of the screen box 1 is located on the connecting line of the two groups of eccentric vibrators 2. The distance between the center of mass of the screen box 1 and the first group of eccentric vibrators 2 is L1, and the distance between the center of mass of the screen box 1 and the second group of eccentric vibrators 2 is 1.5L1-2.5L1. Preferably, the distance between the center of mass of the screen box 1 and the second group of eccentric vibrators 2 is 2L1.
[0023] Furthermore, by adding an eccentric block, the eccentric force generated by the first group of eccentric exciters 2 is made greater than the eccentric force generated by the second group of eccentric exciters 2.
[0024] The implementation principle of the utility model is:
[0025] By setting two groups of eccentric vibrators 2 to cooperate with each other and utilizing the principle of coupled motion, the two groups of eccentric vibrators 2 are placed at different positions of the screen frame respectively. By driving the two groups of vibrators to rotate, the two groups of vibrators produce self-synchronous eccentric rotational motion, thereby driving the screen box 1 to move. The angle between the line connecting the two vibrators and the horizontal is 40°, and the center of mass is located at one-third of the vibrator line close to the lower axis. The vibrator close to the center of mass uses an increased number of eccentric blocks to form a larger eccentric force, driving the screen box 1 to vibrate in a circular manner. After the other group of vibrators forms self-synchronization, it generates synchronous interference to the lower axis vibrator, and generates a larger exciting force in the vertical direction of the line. Since the eccentric forces of the two groups of vibrators are different, the two forces in the direction of the line will not offset each other, so that the vibration trajectory forms an elliptical motion. It integrates the advantages of three types of traditional vibrating screens. The screen frame and the screen can be installed horizontally, which effectively reduces the installation height. It avoids the disadvantages of traditional vibrating screens; the screening efficiency is 50-80% higher than that of circular vibrating screens, and the horizontal installation space is greatly reduced; the diversity of screening media and classification is increased compared to linear screens; the manufacturing difficulty is reduced compared to three-axis elliptical screens, and it has the characteristics of simple structure, convenient maintenance, and strong reliability.
[0026] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of protection claimed by the utility model. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. An elliptical screen, characterized in that: The invention comprises a screen box (1) and two groups of eccentric vibrators (2). In the side projection view of the screen box (1), the first group of eccentric vibrators (2) is close to the front end of the screen box (1), the second group of eccentric vibrators (2) is close to the rear end of the screen box (1) and is higher than the first group of eccentric vibrators (2). The angle θ between the line connecting the two groups of eccentric vibrators (2) and the horizontal plane is 30°-50°.
2. An elliptical screen according to claim 1, characterized in that: The angle θ between the connecting line between the two groups of eccentric vibrators (2) and the horizontal plane is 40°.
3. An elliptical screen according to claim 1, characterized in that: The center of mass of the screen box (1) is located on the connecting line of the two groups of eccentric vibrators (2).
4. An elliptical screen according to claim 3, characterized in that: The distance between the center of mass of the screen box (1) and the first group of eccentric vibrators (2) is L1, and the distance between the center of mass of the screen box (1) and the second group of eccentric vibrators (2) is 1.5L1-2.5L1.
5. An elliptical screen according to claim 4, characterized in that: The distance between the center of mass of the screen box (1) and the second group of eccentric vibrators (2) is 2L1.
6. An elliptical screen according to claim 1, characterized in that: Rubber springs (3) are provided at the front and rear ends of both sides of the screen box (1).
7. An elliptical screen according to claim 1, characterized in that: The eccentric force generated by the first group of eccentric vibrators (2) is greater than the eccentric force generated by the second group of eccentric vibrators (2).